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Related Experiment Video

Updated: May 11, 2026

A High-Yield Streptomyces Transcription-Translation Toolkit for Synthetic Biology and Natural Product Applications

A High-Yield Streptomyces Transcription-Translation Toolkit for Synthetic Biology and Natural Product Applications

Published on: September 10, 2021

An engineered strong promoter for streptomycetes.

Weishan Wang¹, Xiao Li, Juan Wang

¹State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, People's Republic of China.

Applied and Environmental Microbiology

|May 21, 2013

Summary

Researchers engineered a strong promoter, kasOp*, for Streptomyces. This promoter enhances gene expression and actinorhodin production, making it valuable for metabolic engineering and synthetic biology applications in streptomycetes.

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Area of Science:

Microbiology
Molecular Biology
Synthetic Biology

Background:

Well-characterized promoters are crucial for metabolic engineering and synthetic biology.
The native kasOp promoter in Streptomyces coelicolor is temporally expressed and regulated by ScbR and ScbR2.

Purpose of the Study:

To engineer a stronger and more robust promoter from the native kasOp for enhanced gene expression in Streptomyces.
To evaluate the performance of the engineered promoter against existing strong promoters in multiple Streptomyces species.

Main Methods:

Engineering of the kasOp promoter by removing ScbR/ScbR2 binding sites.
Random mutagenesis and screening to identify the strongest promoter variant, kasOp*.
Comparative analysis of kasOp* activity with ermEp* and SF14p in three Streptomyces species at transcriptional, protein, and metabolic output levels.

Main Results:

The engineered kasOp3 promoter, lacking upstream ScbR/ScbR2 binding sites, showed increased strength.
The kasOp* promoter, further modified by removing an internal ScbR binding site, exhibited the highest activity.
kasOp* demonstrated superior transcriptional and protein expression levels compared to ermEp* and SF14p across three Streptomyces hosts.
Expression of actII-ORF4 using kasOp* resulted in the highest actinorhodin production in S. coelicolor.

Conclusions:

kasOp* is a simple, well-defined, and highly active promoter for gene overexpression in Streptomyces.
The engineered kasOp* promoter offers significant advantages for metabolic engineering and synthetic biology in streptomycetes.
kasOp* is a valuable tool for increasing gene expression and improving metabolite production in industrial applications.